Tip: To have enough output power if the audio input is sufficient and the supply voltage/current is sufficient. The power supply voltage is higher and the relative power will be larger. The speakers with different impedances will have different output power. In the case of sufficient voltage and current, the larger the ohms of the horn, the smaller the relative sound power. Please pay attention! Product Name: MINI 2 x 100W Bluetooth 5.0 Power Amplifier Module Product Model: ZK-1002M Chip Model: Domestic Amplifier Chip Audio Input: Bluetooth+AUX+USB Flash Disk+Computer USB(plug and play) Power Supply: DC5-24V(High Power Recommended High Voltage) Adapter Speaker: 20-200W; 4-8 Channels: Left And Right Stereo (Stereo) Bluetooth Version: 5.0( Greater than 15 Meters Without Occlusion) Bluetooth Name: Wuzhi Audio Protection Mechanism: Overheat, Overcurrent, Short Circuit Protection Power Supply Voltage: 12V-----8/20W+20W, 4/40W+40W 15V-----8/35W+35W, 4/60W+60W 19V-----8/55W+55W, 4/80W+80W 24V-----8/70W+70W, 4/100W+100W Compatible Audio & Video Equipment Style: Speakers Compatible Audio & Video Equipment Style: Amplifier Compatible Audio & Video Equipment Style: player colour:Black Material:plastic size: 60 x 60 x 29mm Package Contents: 1 x Module Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.